and doesn't detect my CD-ROM drive at all.

1.6.1 install kernel detects it fine:

.
.
.
pciide0 at pci0 dev 7 function 1: Intel 82371AB IDE controller (PIIX4)
(rev. 0x01)
pciide0: bus-master DMA support present
pciide0: primary channel wired to compatibility mode
atapibus0 at pciide0 channel 0: 2 targets
cd0 at atapibus0 drive 0: <E-IDE CD-ROM CR-850E, , Ver1.11> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
pciide0: primary channel interrupting at irq 14
cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
pciide0: secondary channel wired to compatibility mode
atapibus1 at pciide0 channel 1: 2 targets
cd1 at atapibus1 drive 0: <HL-DT-ST GCE-8520B, , 1.00> cdrom removable
cd1: 32-bit data port
cd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
pciide0: secondary channel interrupting at irq 15
cd1(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
..
.
.


why my -current kernel does not:

.
.
piixide0 at pci0 dev 7 function 1
piixide0: Intel 82371AB IDE controller (PIIX4) (rev. 0x01)
piixide0: bus-master DMA support present
piixide0: primary channel wired to compatibility mode
piixide0: primary channel interrupting at irq 14
atabus0 at piixide0 channel 0
piixide0: secondary channel wired to compatibility mode
piixide0: secondary channel interrupting at irq 15
atabus1 at piixide0 channel 1
.
.
atapibus1 at atabus1: 2 targets
cd1 at atapibus1 drive 0: <HL-DT-ST GCE-8520B, , 1.00> cdrom removable
cd1: 32-bit data port
cd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd1(piixide0:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
.
.
(no CD0, only CD recorder)

it's hardwired kernel config, but -current generic kernel misses CD-ROM
drive too.